Question

The father said to his son Go and post this letter
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Answer 1

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The father told his son to go and post that letter.

Extra Information ↴

When we report orders, requests, advice or intentions, the reporting verb is changed according to the sense implied by what is said.

When we want to report an order, we use words such as order, command and tell. The imperative word is changed into the infinitive form.

Example ↴

Mita said to her son, "Brush twice daily." (direct)

=> Mita told her son to brush twice daily. (indirect)

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Answer 2

Answer:

THE FATHER TOLD HIS SON TO GO AND POST THAT LETTER

this is correct answer